Method and arrangement for operating rotating starting shears
AssigneeSMS Schloemann-Siemag Aktiengesellschaft
InventorsGunter Grenz, Klaus Kuppers, Otmar Palzer
Life of this patent
Estimating the term…
Abstract
A method and an arrangement for operating a rotating starting shear operating in a start-stop operation on rolling stock travelling at different speeds in wire mills, light-section mills, medium plate mills and billet mills, wherein the shear, whose gear system is connected through a coupling to a drive motor, is accelerated from the position of rest to approximately rolling speed and, after the cut has been carried out, is stopped again. A gear mechanism is arranged between the gear unit of the shear and the drive motor, wherein torsion-proof couplings are arranged between the gear unit of the shear and the gear mechanism and between the gear mechanism and the drive motor.
Claims6
A method of operating a rotating starting shear operated in a start-stop operation on rolling stock travelling at different speeds in a rolling mill, the starting shear having shear knives and a gear unit coupled to a drive motor, wherein the shear is accelerated from a position of rest to approximately the speed of the rolling stock and, after a cut has been carried out, the shear is stopped again, a gear mechanism being arranged between the gear unit and the drive motor of the shear, wherein the gear mechanisms is connected to the gear unit of the shear through a torsion-proof first coupling and the gear mechanism is connected to the drive motor through a torsion-proof second coupling, the method comprising carrying out the following steps:
- (a) starting the shear with a low drive torque over a short period of time required for eliminating play of the gear unit and the couplings, subsequently
- (b) carrying out a constant acceleration of the shear with maximum acceleration torque to a desired speed of the shear independently of rolling stock speeds and rolling stock cross-sections, shifting a starting point of the acceleration of the shear in dependence on the rolling stock speed and the rolling stock cross-section, wherein the (desired speed of the shear is selected greater than the speed of the rolling stock,
- (c) beginning the cut shortly prior to reaching the desired speed of the shear at a point in time at which the shear speed is already greater than the speed of the rolling stock;
- and
- (d) automatically monitoring a circumferential speed of the shear knives during the cut in order to maintain an optimum lead of the shear.
Dependencies are inferred from the claim text.